Indicator for continuously registering the mean working pressure.



M. ARNDT. INDICATOR FOR CONTINUOUSLY REGISTERING THE MEAN WORKING PRESSURE. APPLIGATION FILED snm. ze, 1905,

922,553. E Patented May 25, 1909.

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. M. ARNDT. INDICATOR FOR GONTINUOUSLY RBGISTERING- THE MEAN WORKING PRESSURE. APPLICATION FILED SEPT. 26, 1905.

922,553 Patented May 25, 1909.

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M. ARNDT. mnIcAToE EOE coNTINUoUsL-Y REGISTEEING THE MEAN WORKING PRESSURE.

APPLICATION FILED SEPT. 28, 1905.

Patented May 25; 1909.

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MAX ARNDT, OF AIX-LA-CHAPPELLE, GERMANY.

INDICATOR FOR CONTINUOUSLY REGISTERING THE MEAN WORKING PRESSURE.

Specification of Letters Patent.

Patented May 25, 1909.

Application filed September 26, 1905. Serial No. 280,175.

T all whom it may concern:

Be it known that I, MAX ARNDT, a subject of the King of IJrussia, German Emperor, residing at the city of AiX-la-Chapelle, in the Kingdom of Prussia, German TEmpire, have invented certain new and useful Improvements in Indicators for Continuously Registering the Mean Working Pressure and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of ref- L erence marked thereon, which form a part of this specification.

My present invention refers to an indicator by which the mean working pressure of an engine or the like may be continuously registered.

In order that the invention may be clearly understood reference is made to the accompanying drawing in which- Figure 1 is a sectional elevation and Fig. 2 an elevation showing one form by way of eX- ample. Fig. 3 shows my invention applied to an engine.

The indicator consists of a funnel 1 arranged in the casing 5 having an outlet pipe s2, and the funnel is fitted on a hollow part 3 having a bottom outlet 2; said hollow part turns around a pin 4 and has a second outlet s3, the arrangement being such that the part of the medium received by the funnel can only escape by this outlet` A screen 6 is provided on the funnel 1 and protects the outlet S3 from the medium contained in the casing 5.

To the side of the funnel 1 there is rigidly attached the reversing pin 7, which passes freely through the wall of the casing 5 and is intermittently moved by a reciprocating dog 8 or the like, thereby moves the funnel alternately into the one and the other angular The dog 8 is attached to a bevel wheel 9. This bevel wheel meshes with a second smaller bevel wheel 10, arranged, together with the driving pulley 12, on shaft 1 1.

rIhe driving pulley 12 is turned in the following manner: The case D of the indicator is connected by means of its two stays al, and a2, and by means cf the pipes r1 and r2 by the cocks z, el, with the steam enginecylinder C and is kept under constant waterpressure IfI by the bridge u. The reversing of the intercepting-chamiel i, is accomplished by means of the groove-wheel and its cord 13 which is hooked onto the bracket 13b, which is stationary upon the piston-rod K, and, consequently, follows the motion of the machine-piston and which, in one dead-point of the crank of the machine, is in the position I (drawn in heavy lines), and, in the other dead-point, in the position II (drawn in dotted lines). (13a, 13C). The drawing-back of cord 13 is done by means of spiral-spring 12C, which is connected in 12a with the ropepulley 12, and in 12b, with any part of the case S. In pulling the rope of the irst position to the second position the spring 12a, is, therefore, bent, and in passing from the 'first position to the second it roils up again.

The groove-wheel 12 is by the axis 11 'firmly connected with the cone-wheel 10 which locks into the cone-wheel 9. The latter carries a cam 8 which receives an oscillating motion and thereby reverses the intercepting-channel 1 by means of the pin 7 once to one side, once to the other side every time the machine is shifted.

A small pillar 14 may be provided to carry the indicator.

The continuous indicator acts as follows: A medium which is to be measured, for eX- ample, water, enters at inlet m. The piston k of the indicator is put under a load from either the one or the other side in proportion to the difference between pressures active at the moment infront and behind the piston of the engine to be indicated. These loads are taken up by the measuring spring f and the resulting movements of the piston le of 'the indicator are transmitted by the piston rod h of the indicator to the slide d connected therewith, so that the latter alternately opens the passage through the right or the left opening of the slide d in proportion to the working pressure active at the moment on one of the two sides of the piston 7c, thus an amount ci' driving medium corresponding to the difference of the pressures on the two sides of the piston can pass through the passage made by the slide. The driving medium enters through pipes i and il. At the beginning of a stroke of the driving piston of the engine to be indicated, the cord 13 is drawn to the outside by the bracket 18h, and turns at the same time the wheel 12 and with it the aXis 11 and the bevel gears and 9, turn the dog 8, and the latter reverses the funnel 1 by means of pin 7 in such a manner that the wall 1 a of the funnel stands under the middle ol' the passage e, and the amount of medium allowed by slide d to pass through the left side' of the passage e can flow past the funnel l into the casing 5 and thence through outlet S2 into a measuring device of any design. if now be fore the termination of the respective stroke of the engine piston corresponding to this position of the funnel l compression takes place in the cylinder of the engine, the piston 1c of the indicator will, under the action of the compression on its right side, be moved to the left, viz., the right side of the passage eis opened, and the medium now passing through will flow into funnel 1 and thence through outlet s, At the very moment of the change of stroke, however, the funnel is suddenly reversed by the dog 8 which is turned back in the meantime in such a manner that now the other side of the funnel 1b stands under the middle of the passage e; thus the medium passing at the right through the passage e will no longer enter the funnel 1, but will iiow off through the casing 5 and outlet s2. This continues until compression takes place on the other side of the engine piston, when the pressure on the left side of Vthe indicator piston 7c again pushes the slide d to the right, and thereby opens the left side of the passage e; now an amount of medium corresponding to the compression acting in front of the engine piston can flow into the funnel l, until the latter is again suddenly reversed into the opposite position by means of the dog 8 at the end of the stroke of the engine piston, and the amount of medium corresponding to the mean Working pressure of the engine piston again escapes through the outlet s2 during the new stroke until the following compression begins. The amount of medium thus escaping through s2 corresponds with the mean acting working pressure behind the piston., and the amount caught by the funnel l and carried ofi' through outlet s3 corresponds to mean pressure in front of the piston of the engine.

l claim:

l. In an indicator for registering the mean pressures in cylinders, the combination of a casing having an outlet and an inlet, means for opening and closing said inlet adapted to permit and prevent liquid passing through the same, reciprocating means adapted to be operated by the pressures to be measured connected with the latter means, a funnel provided with an outlet under said inlet, and outlet means in said casing, and means actuated by said reciprocating means for oscillat ing said funnel, as set forth.

2. In an indicator for registering the mean pressures in cylinders, the combination of a casing having an outlet and an inlet, a slide valve for opening and closing said inlet, a cylinder having admission ports, a piston in said cylinder, a rod connecting said piston with said slide valve, a funnel provided with an outlet under said slide valve in said casing and means driven from said rod for oscillating said funnel, as set forth.

In testimony that i claim the foregoing as my invention, I have signed my naine in presence of two subscribing witnesses.

MAX ARNDT.

Witnesses:

HENRY CUDDFLIEG, JOHUF ROTHHENT. 

